Add SExpression test and share tests between dart2dart and analyzer2dart.

tests/compiler/dart2js/backend_dart/test_helper.dart

Index: tests/compiler/dart2js/backend_dart/test_helper.dart
diff --git a/tests/compiler/dart2js/backend_dart/dart_new_backend_test.dart b/tests/compiler/dart2js/backend_dart/test_helper.dart
similarity index 53%
copy from tests/compiler/dart2js/backend_dart/dart_new_backend_test.dart
copy to tests/compiler/dart2js/backend_dart/test_helper.dart
index 62c6ca8e2d463fc514a507442eee4f7e28f94e84..a5d5b209cd2c8f03c3418476a9691c1f87b5cd47 100644
--- a/tests/compiler/dart2js/backend_dart/dart_new_backend_test.dart
+++ b/tests/compiler/dart2js/backend_dart/test_helper.dart
@@ -1,61 +1,43 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import '../compiler_helper.dart';
-import 'dart:async';
-import 'package:async_helper/async_helper.dart';
-import 'package:compiler/implementation/dart2jslib.dart';
-import 'package:compiler/implementation/dart_backend/dart_backend.dart';
-import 'package:compiler/implementation/dart_backend/backend_ast_to_frontend_ast.dart'
-    show INSERT_NEW_BACKEND_COMMENT;
-
-const String TestStaticField = """
-class Foo {
-  static int x = 1;
-}
-main() {
-  print(Foo.x);
-}
-""";
-
-Future<String> compile(String code) {
-  MockCompiler compiler = new MockCompiler.internal(
-      emitJavaScript: false,
-      enableMinification: false);
-  return compiler.init().then((_) {
-    compiler.parseScript(code);
-    Element element = compiler.mainApp.find('main');
-    if (element == null) return null;
-    compiler.mainFunction = element;
-    compiler.phase = Compiler.PHASE_RESOLVING;
-    compiler.backend.enqueueHelpers(compiler.enqueuer.resolution,
-                                    compiler.globalDependencies);
-    compiler.processQueue(compiler.enqueuer.resolution, element);
-    compiler.world.populate();
-    compiler.backend.onResolutionComplete();
-    compiler.irBuilder.buildNodes(useNewBackend: true);
-    compiler.phase = Compiler.PHASE_COMPILING;
-    DartBackend backend = compiler.backend;
-    backend.assembleProgram();
-    String generated = compiler.assembledCode;
-    return generated;
-  });
-}
-
-Future test(String code, String feature) {
-  return compile(code).then((output) {
-    if (output == null || !output.contains('main() /* new backend */')) {
-      throw 'New backend appears to be deactivated for $feature.\n'
-            'Output was: $output';
-    }
-  });
-}
-
-main() {
-  INSERT_NEW_BACKEND_COMMENT = true;
-
-  asyncTest(() => Future.forEach([
-    () => test(TestStaticField, 'static fields'),
-  ], (f) => f()));
-}
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library dart_backend.test_helper;
+
+import 'dart:async';
+import 'package:async_helper/async_helper.dart';
+import 'package:compiler/implementation/dart2jslib.dart';
+import '../../../../pkg/analyzer2dart/test/test_helper.dart';
+import '../compiler_helper.dart';
+
+/// Compiles the given dart code (which must include a 'main' function) and
+/// returns the compiler.
+Future<Compiler> compilerFor(String code) {
+  MockCompiler compiler = new MockCompiler.internal(
+      emitJavaScript: false,
+      enableMinification: false);
+  compiler.diagnosticHandler = createHandler(compiler, code);
+  return compiler.init().then((_) {
+    compiler.parseScript(code);
+
+    Element element = compiler.mainApp.find('main');
+    if (element == null) return null;
+
+    compiler.mainFunction = element;
+    compiler.phase = Compiler.PHASE_RESOLVING;
+    compiler.backend.enqueueHelpers(compiler.enqueuer.resolution,
+                                    compiler.globalDependencies);
+    compiler.processQueue(compiler.enqueuer.resolution, element);
+    compiler.world.populate();
+    compiler.backend.onResolutionComplete();
+
+    compiler.irBuilder.buildNodes(useNewBackend: true);
+
+    return compiler;
+  });
+}
+
+/// Test group using async_helper.
+asyncTester(Group group, RunTest runTest) {
+  asyncTest(() => Future.forEach(group.results, runTest));
+}